Cleanup block and field descriptions

[michalwarda]

• [x] Fix chat block description
• [x] Allow dynamically setting field descriptions based on form field state (similar to defaultWhen)
• [x] Render links in description
• [x] Do not render / hide / minimize fields that are unused in scenario ie. when chat is not used as a tool do not show Call formatter.
• [x] In editor handle scenario when user writes {{input... to correctly insert value. Currently it inserts: {{{{input}}